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nature : Part IV of the Periodic System main ethnic group (group C) elements. Atomic number 82. Stable isotopes : 204,206,207,208. Amu 207.2. Blue slightly soft silvery white metal. Ductility weak. Polarity strong. Density 11.35. 327.4 ° C melting point. Boiling Point 1740 ° C Valence and +4 +2. The air quickly oxidized surface layer of dark gray lead oxide film, so that will not lead to further oxidation. Insoluble diluted hydrochloric acid and sulfuric acid. Nitric acid soluble, organic acids (particularly acid) and lye. Lead compounds are toxic! Mainly used for the cables, batteries, sulfuric acid industry, Barbieri alloy, manufacturing tetraethyl lead, paint, soldering, ammunition, cast alloy and the word X-ray and other materials. Nature set prescription Galena, Galena and other white existence. Lead can be calcined into stone after lead oxide of iron or carbon reduction derived. Often miscellaneous Galena silver, zinc, copper and other common elements, and thallium, indium and other scattered elements can sometimes no separation.
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